Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf01e7579735889d3cad22ac6fe96f1a4eb35c6e0aea3b25bdd4b03a2efccc7' 
  AND token = 'iwa05hZk150niiwf41MdsuGe7quELWbkdQCn1DdtvR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}